SALE

If you're looking for the "Titanic" soundtrack, frankly, the WFMU Spring Record Fair today at the Lexington Ave. Armory may not be your best bet. But if you're looking for punk rock, or alternative music that really is alternative, or obscure independent-label bands, or vintage country and blues, then you might just hit the jackpot. WFMU's semi-annual record fair gives listeners a chance to buy some of the music they hear on the station, which is to say, music that is possibly heard nowhere else. There are 45s, 78s, videos, books, CDs and LPs. Lots and lots of LPs, many of them obscure enough to be offering music that has never been transferred to CD. More than 160 dealers pack the armory, and on the backside WFMU sets up a remote facility where the Saturday hosts do their shows live. That includes "Greasy Kid Stuff" with Hova and Belinda, the Radio Thrift Shop with Laura Cantrell, and Meredith. 68 Lexington Ave., at 26th St. Hours: 8 a.